a) Energy level curves e vs. ω for a particle trapped in the 2:5 MMR, librating around with 70° of amplitude. We notice the appearance of the classical Kozai centers at ω = k.90°. The particle can experience large variations in the eccentricity and inclination. In b) we have the same initial conditions as a), except for the libration amplitude thas is now equal to 120°. We notice the disappearance of the classical Kozai centers at ω = k.90°. The large (e,i) variations are not possible, so each orbit will either have high eccentricity and low inclination or vice-versa.